The GoControl Bulbz 5 in.-- 6 in. Z-Wave Smart LED Indoor Recessed Retrofit Light Set suits 5 in. or 6 in. recessed lighting components It replaces old, outdated incandescent screw-in bulbs with tidy and appealing, soft-white efficient LED lighting. The LB65R6Z can be managed wirelessly when used in combination with a Z-Wave controller or center utilizing the controller's user interface or with a smartphone, tablet or PC.